Topic: Surface Chemistry, Test No.: 02, Total MCQs: 15
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Question 1 |
During the adsorption of Krypton on activated charcoal at low temperature [Karnataka CET 2011]
ΔH < 0 and ΔS < 0 | |
ΔH > 0 and ΔS < 0 | |
ΔH > 0 and ΔS > 0 | |
ΔH < 0 and ΔS > 0 |
Question 2 |
The basic principle of Cottrell's precipitator is [Karnataka CET 2008]
Le-Chatelier's principle | |
peptisation | |
neutralisation of charge on colloidal particles | |
scattering of light |
Question 3 |
The colour of sky is due to [Karnataka CET 2008]
absorption of light by atmospheric gases | |
wavelength of scattered light | |
transmission of light | |
All of these |
Question 4 |
Among the following, the surfactant that will form micelles in aqueous solution at the lowest molar concentration at ambient conditions is [IIT JEE 2008]
CH3(CH2)15N+(CH3)3Br− | |
CH3(CH2)11OSO3−Na+ | |
CH3(CH2)6COO−Na+ | |
CH3(CH2)11N+(CH3)3Br− |
Question 5 |
2SO2(g)
is
an example for [Karnataka CET 2007]
irreversible reaction | |
heterogenous catalysis | |
homogenous catalyst | |
neutralization reaction |
Question 6 |
When a sulphur sol is evaporated sulphur is obtained. On mixing with water sulphur sol is not formed. The sol is [Karnataka CET 2007]
reversible | |
hydrophobic | |
hydrophilic | |
lyophilic |
Question 7 |
They are irreversible | |
They are formed by inorganic substances | |
They are readily coagulated by addition of electrolytes | |
They are self stabilized |
Question 8 |
The extent of adsorption of a gas on a solid depends on ______. [Karnataka CET 2005]
temperature of the gas | |
pressure of the gas | |
nature of the gas | |
all are correct |
Question 9 |
An emulsifier is a substance which ______. [Karnataka CET 2005]
coagulates the emulsion | |
homogenises the emulsion | |
stabilises the emulsion | |
accelerates the dispersion of liquid in liquid |
Question 10 |
Volume of a colloidal particle, Vc as compared to the volume of a solute particle in a true solution, Vs could be [AIEEE 2005]
| |
| |
| |
|
Question 11 |
Identify the gas which is readily adsorbed by activated charcoal: [Karnataka CET 2004]
N2 | |
O2 | |
H2 | |
SO2 |
Question 12 |
Identify the correct statement regarding enzymes: [AIEEE 2004]
Enzymes are specific biological catalysts that cannot be poisoned. | |
Enzymes are normally heterogeneous catalysts that are very specific in action | |
Enzymes are specific biological catalysts that can normally function at very high temperature (T - 1000K). | |
Enzymes are specific biological catalysts that possess well defined active sites. |
Question 13 |
According to adsorption theory of catalysis, the speed of the reaction increases because: [CBSE AIPMT 2003]
adsorption produces heat which increases the speed of the reaction. | |
in the process of adsorption, the activation energy of the molecules becomes large. | |
the concentration of the reactant molecules at the active centres of the catalyst becomes high due to adsorption. | |
adsorption lowers the activation energy of the reaction. |
Question 14 |
Which of the following characteristics is not correct for physical adsorption? [AIEEE 2003]
Adsorption on solid is reversible. | |
Adsorption is spontaneous. | |
Adsorption increases with increase in temperature. | |
Both enthalpy and entropy of adsorption are negative. |
Question 15 |
Alum helps in purifying water by [AIEEE 2002]
coagulating the mud particles | |
sulphate part which combines with dirt and removes it | |
forming Si complex with clay particles | |
making mud water soluble |
nice ones!!!